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Finding the Fourth Proportional to 404.48, 555.20 and 358.40

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Solution

The fourth proportional to 404.48, 555.20 and 358.40 is: 491.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.48 : 555.20 = 358.40 : x
  2. Step 2: Convert to fraction form
    404.48/555.20 = 358.40/x
  3. Step 3: Cross multiply
    404.48x = 555.20 × 358.40
  4. Step 4: Simplify right side
    404.48x = 198,983.68
  5. Step 5: Solve for x
    x = 198,983.68/404.48
  6. Step 6: Final answer
    x = 491.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.